Filter press feed pump

Abstract

The utility model provides a kind of filter press feed pump, it includes material cylinder and hydraulic cylinder;The hydraulic cylinder includes: hydraulic cylinder body, hydraulic piston and hydraulic piston rod;The hydraulic piston rod center is provided with via hole;The material cylinder includes: material cylinder body, material piston and material piston rod;The inside end of material piston rod is connected with the material piston, outside end is inserted into the via hole of hydraulic piston rod from the material cylinder body, and is fixedly connected with hydraulic piston rod.This application is designed by lengthening material piston rod, material piston rod penetrates the middle via hole of entire hydraulic piston rod, to fundamentally ensure the coaxiality of material piston rod and hydraulic piston rod when assembling, when working, they move as a unified whole, rigidity is greatly improved, to reduce the damage to material cylinder and hydraulic cylinder sealing structure, reduce the risk of hydraulic cylinder hydraulic oil leakage, material cylinder material overflow.

Description

Technical Field

[0001] This utility model relates to the field of pump technology for filter presses, and in particular to a filter press feed pump. Background Technology

[0002] A filter press is a commonly used solid-liquid separation machine. By applying pressure to a solid-liquid mixture, the liquid material in the mixture is forced to seep out and separate from the solid material. Filter presses are mostly used to process solid-liquid mixtures such as slurry and mud. These materials usually have high viscosity and poor flowability, so a dedicated feed pump is required when using a filter press to pump the material into the filter press.

[0003] Currently, dedicated pumps for filter presses typically include a material cylinder and a hydraulic cylinder. The material piston rod of the material cylinder is directly connected to the hydraulic piston rod of the hydraulic cylinder, or through a coupling. The coaxiality of the material piston rod and the hydraulic piston rod inevitably involves machining and assembly errors. During long-term use, this will inevitably damage the sealing structure of the material cylinder and the hydraulic cylinder, leading to hydraulic oil leakage from the hydraulic cylinder and material overflow from the material cylinder, resulting in significant waste, increased maintenance costs, and a reduced service life of the dedicated pump. Utility Model Content

[0004] The purpose of this utility model is to provide a filter press feed pump to solve at least one of the above-mentioned technical problems in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides a filter press feed pump, comprising: a material cylinder and a hydraulic cylinder; The hydraulic cylinder includes: a hydraulic cylinder body, a hydraulic piston, and a hydraulic piston rod; the hydraulic piston rod has a through hole at its center. The material cylinder includes: a material cylinder body, a material piston, and a material piston rod; the inner end of the material piston rod is connected to the material piston, and the outer end extends out of the material cylinder body, inserts into the through hole of the hydraulic piston rod, and is fixedly connected to the hydraulic piston rod.

[0006] This application extends the material piston rod, which passes through the central hole of the entire hydraulic piston rod, thus fundamentally ensuring the coaxiality of the material piston rod and the hydraulic piston rod during assembly. During operation, the two move as a unified whole, greatly improving rigidity and reducing damage to the sealing structure of the material cylinder and hydraulic cylinder, thereby reducing the risk of hydraulic oil leakage from the hydraulic cylinder and material overflow from the material cylinder.

[0007] Furthermore, it also includes a connecting cylinder, one end of which is fixedly connected to the material cylinder and the other end of which is fixedly connected to the hydraulic cylinder; the outer end of the material piston rod extends into the connecting cylinder, is inserted into the through hole of the hydraulic piston rod, and is connected to the hydraulic piston rod.

[0008] This application adds a connecting cylinder to create a buffer space between the material cylinder and the hydraulic cylinder, ensuring that the sealing structure of the hydraulic cylinder does not contact the material cylinder, thus preventing spilled material from damaging the sealing structure.

[0009] Furthermore, the material cylinder is provided with a first shaft hole at one end of the connecting cylinder, and a first guide sleeve is inserted into the first shaft hole; the outer end of the material piston rod extends out through the guide hole in the middle of the first guide sleeve.

[0010] Furthermore, a sealing structure such as a sealing ring is provided between the guide hole of the first guide sleeve and the material piston rod.

[0011] Furthermore, the hydraulic cylinder is a double-rod hydraulic cylinder, with a second shaft hole and a third shaft hole respectively provided at both ends; a second guide sleeve and a third guide sleeve are respectively inserted into the second shaft hole and the third shaft hole; One side of the hydraulic piston rod of the double-rod hydraulic cylinder extends into the connecting cylinder through the middle guide hole of the second guide sleeve and abuts against the upper limit ring platform of the material piston rod; the other side of the hydraulic piston rod of the double-rod hydraulic cylinder extends out through the middle guide hole of the third guide sleeve.

[0012] Furthermore, the through hole extends axially through the hydraulic piston rods on both sides of the double-rod hydraulic cylinder, and the outer end of the material piston rod passes through the through hole through the hydraulic piston rods on both sides of the double-rod hydraulic cylinder.

[0013] Preferably, after the outer end of the material piston rod extends out of the other hydraulic piston rod through the through hole, it is locked and fixed to the other hydraulic piston rod by means of a rear positioning pad, a back nut, and a lock nut.

[0014] Preferably, a front positioning pad is provided between the hydraulic piston rod on one side of the double-rod hydraulic cylinder and the limiting ring platform of the material piston rod.

[0015] Alternatively, the hydraulic cylinder can also be a single-rod hydraulic cylinder, in which the material piston rod passes through the through hole, extends to the back of the piston, and is then locked and fixed using fasteners such as back nuts and lock nuts.

[0016] Furthermore, the material cylinder is provided with a first discharge port and a second discharge port at both ends, which are connected to the rod chamber and the rodless chamber, respectively; a first discharge check valve and a second discharge check valve are respectively provided at the first discharge port and the second discharge port to control the unidirectional flow of material.

[0017] Furthermore, the material cylinder is provided with a first feed port and a second feed port at both ends, which are connected to the rod chamber and the rodless chamber, respectively; a first feed check valve and a second feed check valve are provided at the first feed port and the second feed port, respectively, to control the unidirectional flow of material into the rod chamber and the rodless chamber.

[0018] Furthermore, it also includes a hydraulic control system for controlling the extension or retraction of the hydraulic piston rod; The hydraulic control system includes a first oil supply mechanism and a second oil supply mechanism; The first oil supply mechanism includes a first oil pump and a first motor; the second oil supply mechanism includes a second oil pump and a second motor. The first oil pump and the second oil pump are respectively connected to the hydraulic cylinder. The first motor and the second motor work simultaneously or selectively to drive the first oil pump and the second oil pump to supply oil to the hydraulic cylinder.

[0019] In this configuration, one of the first and second motors is a high-power motor, and the other is a low-power motor. Preferably, the power difference between the two motors is 1-10 times.

[0020] This application sets up two oil supply mechanisms, and in particular uses two motors with different power ratings (one large and one small), thereby forming three working modes to meet the power input requirements of different working conditions, while avoiding the waste of electrical energy.

[0021] Furthermore, the hydraulic control system includes a three-position four-way directional valve, a main oil supply line, and a main oil return line. The first working port and the second working port of the three-position four-way directional valve are respectively connected to the two oil chambers of the hydraulic cylinder through oil circuits. The oil inlet and the oil return port of the three-position four-way directional valve are respectively connected to one end of the main oil supply line and the main oil return line.

[0022] Furthermore, the oil outlets of the first oil pump and the second oil pump are respectively connected to the other end of the main oil supply pipeline through the first pipeline and the second pipeline.

[0023] Furthermore, both the first and second pipelines are equipped with check valves to limit the hydraulic oil to flow unidirectionally to the main oil supply pipeline.

[0024] Furthermore, the inlets of the first and second oil pumps are respectively connected to the oil tank via oil lines; and the other end of the return oil main line is connected to the oil tank. Preferably, a pressure control valve is installed on the return oil main line to maintain its internal pressure within a reasonable range, thereby ensuring smooth movement of the hydraulic piston.

[0025] Furthermore, it also includes a controller, which is connected to the first motor, the second motor and the three-position four-way directional valve respectively, and is used to control the magnitude of power input, the magnitude of input oil volume, and the extension and retraction movement of the hydraulic piston rod.

[0026] By adopting the above technical solution, this utility model has the following beneficial effects: This utility model provides a filter press feed pump in which the material piston rod passes through the middle hole of the entire hydraulic piston rod, thereby fundamentally ensuring the coaxiality of the material piston rod and the hydraulic piston rod during assembly. During operation, the two move as a unified whole, greatly improving rigidity and reducing damage to the sealing structure of the material cylinder and the hydraulic cylinder, thus reducing the risk of hydraulic oil leakage in the hydraulic cylinder and material overflow in the material cylinder. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a top view of the filter press feed pump provided in Embodiment 1 of this utility model; Figure 2 for Figure 1 The side view of the filter press feed pump shown; Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 for Figure 1 A schematic diagram of the hydraulic cylinder provided in Example 1; Figure 5 This is a schematic diagram of the feed pump of the filter press with a single-rod hydraulic cylinder in Example 1; Figure 6 The working principle diagram of the hydraulic control system provided in Embodiment 2 of this utility model.

[0029] Figure label: 1-Oil tank; 10-First oil supply mechanism; 11-First oil pump; 15-First motor; 20-Second oil supply mechanism; 21-Second oil pump; 25-Second motor; 30-Three-position four-way directional valve; 31-Main oil supply pipeline; 32-Main oil return pipeline; 33-First pipeline; 34-Second pipeline; 35-Check valve; 40-Material cylinder; 41-Material cylinder body; 42-Material piston; 43-Material piston rod; 44-First shaft hole; 45-First guide sleeve; 46-First discharge port; 47-Second discharge port; 48 49-First feed inlet; 50-Second feed inlet; 51-Hydraulic cylinder; 52-Hydraulic piston; 53-Hydraulic piston rod; 53a-Left hydraulic piston rod; 53b-Right hydraulic piston rod; 54-Through hole; 55-Second guide sleeve; 56-Third guide sleeve; 57-Lock nut; 58-Rear positioning pad; 59-Back nut; 60-Connecting cylinder; 61-Front positioning pad; 71-First discharge check valve; 72-Second discharge check valve; 73-First feed check valve; 74-Second feed check valve. Detailed Implementation

[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The present invention will be further explained below with reference to specific embodiments.

[0034] Example 1 See Figure 1-4 As shown, this embodiment provides a filter press feed pump, including a material cylinder 40 and a hydraulic cylinder 50. The hydraulic cylinder 50 includes a hydraulic cylinder body 51, a hydraulic piston 52, and a hydraulic piston rod 53; the hydraulic piston rod 53 has a through hole 54 at its center.

[0035] The material cylinder 40 includes: a material cylinder body 41, a material piston 42, and a material piston rod 43; the inner end of the material piston rod 43 is connected to the material piston 42, and the outer end of the material piston rod 43 extends out of the material cylinder body 41, inserts into the through hole 54 of the hydraulic piston rod 53, and is fixedly connected to the hydraulic piston rod 53.

[0036] This application extends the material piston rod 43, which passes through the central through hole 54 of the entire hydraulic piston rod 53. This fundamentally ensures the coaxiality of the material piston rod 43 and the hydraulic piston rod 53 during assembly. During operation, the two move as a unified whole, greatly improving rigidity and reducing damage to the sealing structure of the material cylinder 40 and the hydraulic cylinder 50. This also reduces the risk of hydraulic oil leakage from the hydraulic cylinder 50 and material overflow from the material cylinder 40.

[0037] Furthermore, it also includes a connecting cylinder 60, one end of which is fixedly connected to the material cylinder 41, and the other end is fixedly connected to the hydraulic cylinder 51; the outer end of the material piston rod 43 extends into the connecting cylinder 60, is inserted into the through hole 54 of the hydraulic piston rod 53, and is connected to the hydraulic piston rod 53.

[0038] This application adds a connecting cylinder 60, which creates a buffer space between the material cylinder 41 and the hydraulic cylinder 51, so that the sealing structure of the hydraulic cylinder 51 does not come into contact with the material cylinder 41, thus preventing the overflowing material from damaging the sealing structure.

[0039] Furthermore, the material cylinder 41 is provided with a first shaft hole 44 at one end of the connecting cylinder 60, and a first guide sleeve 45 is inserted into the first shaft hole 44; the outer end of the material piston rod 43 extends out through the guide hole in the middle of the first guide sleeve 45. Preferably, a sealing structure such as a sealing ring is provided between the guide hole of the first guide sleeve 45 and the material piston rod 43.

[0040] Preferably, the hydraulic cylinder 50 is a double-rod hydraulic cylinder, and a second shaft hole and a third shaft hole are respectively provided at both ends of the double-rod hydraulic cylinder; a second guide sleeve 55 and a third guide sleeve 56 are respectively inserted into the second shaft hole and the third shaft hole; The left hydraulic piston rod 53a of the double-rod hydraulic cylinder 50 extends into the connecting cylinder 60 through the middle guide hole of the second guide sleeve 55 and abuts against the upper limit ring platform of the material piston rod 43; the right hydraulic piston rod 53b of the double-rod hydraulic cylinder 50 extends out through the middle guide hole of the third guide sleeve 56.

[0041] Furthermore, the through hole 54 axially passes through the left hydraulic piston rod 53a and the right hydraulic piston rod 53b of the double-rod hydraulic cylinder 50, and the outer end of the material piston rod 43 passes through the through hole 54 through the hydraulic piston rods 53 on both sides of the double-rod hydraulic cylinder 50. The first guide sleeve 45, the second guide sleeve 55, and the third guide sleeve 56 cooperate with the material piston rod 43 to pass through the through hole 54 through the left hydraulic piston rod 53a and the right hydraulic piston rod 53b, thereby ensuring the coaxiality and integrity of the hydraulic cylinder 50 and the material cylinder 40, ensuring smooth operation of both, low vibration, and more reliable sealing structure.

[0042] Preferably, after the outer end of the material piston rod 43 extends out of the right hydraulic piston rod 53b through the through hole 54, it is locked and fixed to the right hydraulic piston rod 53b by the rear positioning pad 58, the back nut 59 and the lock nut 57.

[0043] Preferably, a front positioning pad 61 is provided between the left hydraulic piston rod 53a of the double-rod hydraulic cylinder 50 and the limiting ring platform of the material piston rod 43.

[0044] The front positioning pad 61 and the rear positioning pad 58 are limiting and guiding components used to ensure the assembly accuracy of the components connected at both ends. Taking the front positioning pad 61 as an example, the left side of the front positioning pad 61 is provided with a positioning countersink that engages with the limiting ring platform of the material piston rod 43, and its central shaft hole is in high-precision fit with the material piston rod 43; the right side of the front positioning pad 61 is provided with a radial positioning ring platform, which is inserted into the assembly countersink at the end of the left hydraulic piston rod 53a, thereby ensuring the assembly accuracy of the material piston rod 43 and the left hydraulic piston rod 53a.

[0045] Alternatively, see Figure 5 As shown, the hydraulic cylinder 50 can also be a single-rod hydraulic cylinder. The material piston rod 43 passes through the through hole 54, passes through the hydraulic piston rod 53, extends to the back of the hydraulic piston 52, and is then locked and fixed by fasteners such as back nuts and lock nuts.

[0046] Furthermore, the material cylinder 41 is provided with a first discharge port 46 and a second discharge port 47 at both ends, which are connected to the rod chamber and the rodless chamber, respectively; a first discharge check valve 71 and a second discharge check valve 72 are provided at the first discharge port 46 and the second discharge port 47, respectively, to control the unidirectional flow of material.

[0047] Furthermore, the material cylinder 41 is provided with a first feed port 48 and a second feed port 49 at both ends, which are connected to the rod chamber and the rodless chamber, respectively; a first feed check valve 73 and a second feed check valve 74 are provided at the first feed port 48 and the second feed port 49, respectively, to control the unidirectional flow of material into the rod chamber and the rodless chamber.

[0048] In this embodiment, the material piston rod 43 passes through the middle through hole 54 of the entire hydraulic piston rod 53, thereby fundamentally ensuring the coaxiality of the material piston rod 43 and the hydraulic piston rod 53 during assembly. During operation, the two move as a unified whole, greatly improving rigidity and reducing damage to the sealing structure of the material cylinder 40 and the hydraulic cylinder 50, thus reducing the risk of hydraulic oil leakage in the hydraulic cylinder 50 and material overflow in the material cylinder 40.

[0049] Example 2 This embodiment is basically the same as embodiment 1, except that: See Figure 6 As shown, this embodiment also includes a hydraulic control system for controlling the extension or retraction of the hydraulic piston rod 53. The hydraulic control system includes a first oil supply mechanism 10 and a second oil supply mechanism 20; The first oil supply mechanism 10 includes a first oil pump 11 and a first motor 15; the second oil supply mechanism 20 includes a second oil pump 21 and a second motor 25. The first oil pump 11 and the second oil pump 21 are respectively connected to the hydraulic cylinder 50. The first motor 15 and the second motor 25 work simultaneously or selectively to drive the first oil pump 11 and the second oil pump 21 to supply oil to the hydraulic cylinder 50.

[0050] In this motor, one of the first motor 15 and the second motor 25 is a high-power motor, and the other is a low-power motor. Preferably, the power difference between the two motors is 1-10 times.

[0051] Furthermore, the hydraulic control system includes a three-position four-way directional valve 30, a main oil supply line 31, and a main oil return line 32. The first working port and the second working port of the three-position four-way directional valve 30 are respectively connected to the two oil chambers of the hydraulic cylinder 50 through oil circuits. The oil inlet and the oil return port of the three-position four-way directional valve 30 are respectively connected to one end of the main oil supply line 31 and the main oil return line 32.

[0052] Furthermore, the oil outlets of the first oil pump 11 and the second oil pump 21 are respectively connected to the other end of the main oil supply pipeline 31 through the first pipeline 33 and the second pipeline 34.

[0053] Furthermore, a one-way valve 35 is provided on both the first pipeline 33 and the second pipeline 34 to limit the hydraulic oil to flow unidirectionally to the main oil supply pipeline 31.

[0054] Furthermore, the oil inlets of the first oil pump 11 and the second oil pump 21 are respectively connected to the oil tank 1 via oil lines; and the other end of the return oil main line 32 is connected to the oil tank 1. Preferably, a pressure control valve is installed on the return oil main line 32 to maintain its internal pressure within a reasonable range, thereby ensuring the smooth movement of the hydraulic piston 52.

[0055] Furthermore, it also includes a controller, which is connected to the first motor 15, the second motor 25 and the three-position four-way directional valve 30 respectively, and is used to control the magnitude of power input, the magnitude of input oil volume, and the extension and retraction movement of the hydraulic piston rod 53.

[0056] This application sets up two oil supply mechanisms, and in particular uses two motors with different power ratings (one large and one small), thereby forming three working modes to meet the power input requirements of different working conditions, while avoiding the waste of electrical energy.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A filter press feed pump, characterized in that, include: Material cylinders and hydraulic cylinders; The hydraulic cylinder includes: a hydraulic cylinder body, a hydraulic piston, and a hydraulic piston rod; the hydraulic piston rod has a through hole at its center. The material cylinder includes: a material cylinder body, a material piston, and a material piston rod; the inner end of the material piston rod is connected to the material piston, and the outer end extends out of the material cylinder body, inserts into the through hole of the hydraulic piston rod, and is fixedly connected to the hydraulic piston rod.

2. The filter press feed pump according to claim 1, characterized in that, It also includes a connecting cylinder, one end of which is fixedly connected to the material cylinder and the other end of which is fixedly connected to the hydraulic cylinder; the outer end of the material piston rod extends into the connecting cylinder, is inserted into the through hole of the hydraulic piston rod, and is connected to the hydraulic piston rod.

3. The filter press feed pump according to claim 2, characterized in that, The material cylinder has a first shaft hole at one end of the connecting cylinder, and a first guide sleeve is inserted into the first shaft hole; the outer end of the material piston rod extends out through the guide hole in the middle of the first guide sleeve.

4. The filter press feed pump according to claim 2, characterized in that, The hydraulic cylinder is a double-rod hydraulic cylinder, with a second shaft hole and a third shaft hole respectively provided at both ends; a second guide sleeve and a third guide sleeve are respectively inserted into the second shaft hole and the third shaft hole; One side of the hydraulic piston rod of the double-rod hydraulic cylinder extends into the connecting cylinder through the middle guide hole of the second guide sleeve and abuts against the upper limit ring platform of the material piston rod; the other side of the hydraulic piston rod of the double-rod hydraulic cylinder extends out through the middle guide hole of the third guide sleeve.

5. The filter press feed pump according to claim 4, characterized in that, The through hole extends axially through the hydraulic piston rods on both sides of the double-rod hydraulic cylinder, and the outer end of the material piston rod passes through the through hole through the hydraulic piston rods on both sides of the double-rod hydraulic cylinder.

6. The filter press feed pump according to claim 5, characterized in that, After the outer end of the material piston rod extends out of the through hole to the other hydraulic piston rod, it is locked and fixed to the other hydraulic piston rod by the rear positioning pad, the back nut and the lock nut.

7. The filter press feed pump according to claim 5, characterized in that, A front positioning pad is provided between the hydraulic piston rod on one side of the double-rod hydraulic cylinder and the limiting ring platform of the material piston rod.

8. The filter press feed pump according to claim 1, characterized in that, The hydraulic cylinder can also be a single-rod hydraulic cylinder, in which the material piston rod passes through the through hole, extends to the back of the piston, and is then locked and fixed by fasteners.

9. The filter press feed pump according to claim 1, characterized in that, The material cylinder has a first discharge port and a second discharge port at both ends, which are connected to the rod chamber and the rodless chamber, respectively. A first discharge check valve and a second discharge check valve are respectively installed at the first discharge port and the second discharge port to control the unidirectional flow of material.

10. The filter press feed pump according to claim 1, characterized in that, The material cylinder is provided with a first feed port and a second feed port at both ends, which are connected to the rod chamber and the rodless chamber, respectively. A first feed check valve and a second feed check valve are provided at the first feed port and the second feed port, respectively, to control the unidirectional flow of material into the rod chamber and the rodless chamber.

11. The filter press feed pump according to claim 1, characterized in that, It also includes a hydraulic control system for controlling the extension or retraction of the hydraulic piston rod; The hydraulic control system includes a first oil supply mechanism and a second oil supply mechanism; The first oil supply mechanism includes a first oil pump and a first motor; the second oil supply mechanism includes a second oil pump and a second motor. The first oil pump and the second oil pump are respectively connected to the hydraulic cylinder. The first motor and the second motor work simultaneously or selectively to drive the first oil pump and the second oil pump to supply oil to the hydraulic cylinder.

12. The filter press feed pump according to claim 11, characterized in that, The hydraulic control system includes a three-position four-way directional valve, a main oil supply line, and a main oil return line. The first working port and the second working port of the three-position four-way directional valve are respectively connected to the two oil chambers of the hydraulic cylinder through oil lines. The oil inlet and the oil return port of the three-position four-way directional valve are respectively connected to one end of the main oil supply line and the main oil return line.

13. The filter press feed pump according to claim 12, characterized in that, The oil outlets of the first oil pump and the second oil pump are respectively connected to the other end of the main oil supply pipeline through the first pipeline and the second pipeline.

14. The filter press feed pump according to claim 13, characterized in that, Both the first and second pipelines are equipped with check valves to limit the hydraulic oil to flow unidirectionally to the main oil supply pipeline.

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